Vacuum-tube amplifier



Aug. 21, 1923. mfismz v H. DE F. ARNOLD VAGUUM TUBE AMPLIFIER Original Filed Sept. 3, 1915 //7 va/vfar:

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MAPLEWOOD, NEW JERSEYfASSIG-NOE '10 WESTERN OF NEW YORK, N. 5. A COEYOEA'EKQN 0F vacuum-roan nnrrnrrrnn.

original application filed September 3, 1915, Serial 1919, Serial No. 285,857. Divided and this app] To all whom it may concern:

Be it known that I, HAROLD D. ARNoLo,

a citizen of the United States, residing at Maplewood, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Vacuum-Tube Amplifiers, 'of which the following is a full, clear, concise, and sheet description.

This invention relates'to vacuum tube amplifiers, and more particularly to arrangements for supplying space current thereto.

An object of this invention is to provide means whereby a plurality of vacuum tubes to be used as repeaters'or amplifiers may be supplied with space current from a. single source, but in such a manner thatcurrent changes in one tube due to signalsbeing repeated cannot be impressed upon another tube through said source.

With the arrangement shown herein, a

single source of space current is used'to energize both tubes of a two stage amplifier, and in the branches of-the circuit therefore are interposed filters of series inductance and shunt capacity to prevent alternating current from being bypassed therethrough.

The invention described and claimed herein is divided outof my applications, Serial No. 48,873, filed September 3, 1915, and Serial No. 285,857, filed March 28, 1919.

For further details, reference may be made to the accompanying drawings in which the single figure illustrates diagrammatically a two stage amplifier embodying the invention.

eferring to the drawing by'reference numerals, the amplifier set comprises a tandem arrangement of two vacuum tubes 10 and 11 each having cathode 12, a grid or control electrode 13, and an anode 14. The cathodes 12 are maintained in a condition of thermionic activity by currents from sources 15."-

he input circuit of'tube 10 comprises terminals 16, 17 adapted to be connected to a suitable source of electric impulses to be repeated, a resistance 18 bridged across the input electrodes, and a battery 19 adapted to maintain the grid electrode at a negative potential with respect to the cathode. Current between the anode and cathode is supplied from battery or other suitable source 20, the current passing in series through the inductance 21 and the transformerprlmary Ito. 48,873. Divided and application flied march 28,

ication filed August 28, 1920. Serial No. 466,895.

22. A shunt condenser 23 provides for the alternating current.

The transformer secondary 24 has connected across its terminals a resistance 25,

a path one end of which is connected to the cathode of tube 11. A connection from resistance 25 to the grid of tube 11 comprises the movable contact 26 and the battery 27, the function of the latter being to provide the necessary negative potential on the grid.

Direct current is supplied to the tube 11 from source 20, through inductances 28 and 29, and grounds 30 and 31. Condenser 32 is shunted across the direct current circuit. The output'circuit for alternating current comprises the condenser 33 and the primary 34 of a transformer, the which isadapted to be connected through terminals 36'and 37 to any suitable receiving circuit.

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The series inductances 21 and 28 and the shunt condensers 23' and 32 serve to prevent potential variations from the source or'from either tube without being impressed through the supply circuit on the other tube.

While I have shown and described one embodiment of the invention, it is obvious that it may assume any desired form within the scope of the appended claims.

What is claimed is:

1. In combination, a plurality of vacuum tube repeaters, a common source of space current for said repeaters, the circuit between one of said repeaters and said source comprising series inductance, and a path comprising capacity bridged across said air cuit betwe said source and said repeater.

2. In cofibination, a plurality of vacuum tube repeaters, a common current for said repeaters,

secondary of Inoperation, the signals or other impulses,

source of space -.2' the circuit between each of said repeaters and said source comprising series inductance, and a path comprising capacity bridged across each of said circults between said source and the respective repeaters.

3. In combination, a plurality of vacuum tube repeaters, said repeaters being conneoted in multiple to a common source of space current, and means to prevent alternating currents from one of said repeaters from flowing in the portion of the space current circuit common to said repeaters.

' tubes,

4. In combination, a plurality of vacuum tube re aters, said repeaters being .con-

,nected 1p multiple to a common source of revent alterbridgid across the circuit between one of said tu s and said source.

6. In a multi-stage amplifier, a plurality ,of vacuum tubes connected in tandem, a

common source of space current for said tubes, branch circuits connecting said source andsaid tubes and a filter comprislng series inductance in each of said circuits and a' path containing capacity bridged across ,each of'said circuits between each of said tubes and said source.

7. In combination, a plurality of vacuum tube translating devices, a common source of potential for said vacuum tubes, 9. ciramplifiers having pl source 0 current for supplying.

cuit connecting each of said tubes to said source contaimng series inductance and a path comprising capacity bridged across each of said circuits.

8. In combination, a plurality of vacuum tube translating devices, a common source of current for energizing said tubes, and a path comprising capacity bridged. across each of the circuits connecting said tubes to said source.

9.1!: combination a plurality of vacuum tube translating devices, a common source of current for energizing said vacuum tubes, each of the circuits between said tubes and said source com rising series impedance and a capacity e ectively' in shunt to said source for preventing interference' between said tubes.

10. The combination system of a series of amplifiers connected in cascade, amplifiers having plate and grid circuits, 8. common source 0 current for supplyin current to the plate circuits of all of sai amplifiers in succession from the last-to the first of said amplifiers, and filter connecin an am lifying electron dischar each of said tions between successive amplifierhof the series. a

11. The combination in an amplifying system of a series of electron discharge am plifiers connected in cascade, each of'said ate and grid circuits, 9.

common current to the plate circuits of all of said amplifiers, and filter connecti ns between successive amplifiers of the sari s.

In witness whereof, I hereunto'subscribe my name this 25th day of August A. D., 1920.

HAROLD DE FOREST ARNOLD. 

